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    Assessment of low-scaling approximations to the equation of motion coupled-cluster singles and doubles equations

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    Caricato_2014.pdf (545.1Kb)
    Issue Date
    2014
    Author
    Goings, Joshua J.
    Caricato, Marco
    Frisch, Michael J.
    Li, Xiaosong
    Publisher
    American Meteorological Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Rights
    The following article appeared in Journal of Chemical Physics and may be found at http://scitation.aip.org/content/aip/journal/jcp/141/16/10.1063/1.4898709
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    Abstract
    Methods for fast and reliable computation of electronic excitation energies are in short supply, and little is known about their systematic performance. This work reports a comparison of several low-scaling approximations to the equation of motion coupled cluster singles and doubles (EOM–CCSD) and linear-response coupled cluster singles and doubles (LR–CCSD) equations with other single reference methods for computing the vertical electronic transition energies of 11 small organic molecules. The methods, including second order equation-of-motion many-body perturbation theory (EOM–MBPT2) and its partitioned variant, are compared to several valence and Rydberg singlet states. We find that the EOM–MBPT2 method was rarely more than a tenth of an eV from EOM–CCSD calculated energies, yet demonstrates a performance gain of nearly 30%. The partitioned equation-of-motion approach, P–EOM–MBPT2, which is an order of magnitude faster than EOM–CCSD, outperforms the CIS(D) and CC2 in the description of Rydberg states. CC2, on the other hand, excels at describing valence states where P–EOM–MBPT2 does not. The difference between the CC2 and P–EOM–MBPT2 can ultimately be traced back to how each method approximates EOM–CCSD and LR–CCSD. The results suggest that CC2 and P–EOM–MBPT2 are complementary: CC2 is best suited for the description of valence states while P–EOM–MBPT2 proves to be a superior O(N5) method for the description of Rydberg states.
    URI
    http://hdl.handle.net/1808/21550
    DOI
    https://doi.org/10.1063/1.4898709
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    • Chemistry Scholarly Works [626]
    Citation
    Goings, J. J., Caricato, M., Frisch, M. J., & Li, X. (2014). Assessment of low-scaling approximations to the equation of motion coupled-cluster singles and doubles equations. The Journal of chemical physics, 141(16), 164116.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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